Did you know that just off the coast of Eastport, Maine is the largest tidal whirlpool in the western hemisphere? It's the 'Old Sow' whirlpool has a diameter of approximately 250 feet.

The Old Sow is one of five major whirlpools worldwide.

Small craft, especially vessels with keels (sailboats) and human-powered vessels, are warned to avoid these waters when the tide is running.